1.The apple tree,swinging gently in the breeze,had a good crop of fruit.
在这里swing作伴随状语?had...作同位语?
2.the castle ,burnt down in 1485,was never rebuilt.那在这里两个都是同位语吗?
3.the noise of something being dragged on the floor could be heard clearly in the quiet night.为什么这里something后面不能直接用dragged呢?